6-1. Computer Link Function Using a C.C.U.
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6-1.Computer Link Function Using a C.C.U.
The FP3/FP5 Programmable Controllers can communicate with a computer which is also in the W Type(Wire)
Link System by using a C.C.U.(Computer Communication Unit).
In the Computer Link function, communication is performed using the MEWTOCOL-COM protocol, the half-
duplex communication protocol for the FP Series Programmable Controllers. With the MEWTOCOL-COM, you
can read, write or monitor data stored in the memory of the programmable controller(such as contact data and timer
values) from the computer. The program used by the computer can be created with any programming language
such as BASIC or C.
Notes :
Configuration of the Computer Link in a W Type(Wire) Link System
To configure the Computer Link in a W Type(Wire) Link System, a C.C.U.(Computer Communication Unit) is
required.
The Computer Link function is performed using the inter-network link function of the C.C.U..
When the inter-network function is used, first communications take place on the network that the target
Programmable Controller belongs to, and then Computer Link communication function is performed using the
MEWTOCOL-COM.
Notes :
• In the relay stations, no more than 3 link units can be installed.
• The C.C.U.(Computer Communication Unit) version should be 1.3 or higher.
• The position of each network ralative to the computer is specified using the word “depth” and
starting from 0 as following :
Relative position counting from the computer
Network A : depth 0
Network B : depth 1
Network C : depth 2
• The Computer Link function is available up to a relative depth of 2 as shown above.
• At the relay stations, each Programmable Controller belongs to 2 Networks.
[EXAMPLE] Station 01(UNIT NO. 01) in Network B also belongs to Network A.
• The details of MEWTOCOL-COM protocol are explained in the “FP3/FP5 C.C.U.(Computer
Communication Unit) Technical Manual”.
Computer
Network A
(Computer Link)
Station 01(UNIT NO. 01)
in Network B
Station 02(UNIT NO. 02)
in Network B
Station 10(UNIT NO. 10)
in Network B
Station 10(UNIT NO. 10)
in Network C
Station 02(UNIT NO. 02)
in Network C
Station 03(UNIT NO. 03)
in Network C
Station 32(UNIT NO. 32)
in Network C
Station 03(UNIT NO. 03)
in Network B
Relay station
Network B[W type(wire) Link System]
Network C[W type(wire) Link System]
